Ultrasonic distance sensor MB1040 with a range from 0 to 645 cm. It has an output in the form of a serial interface, analog signal or generates an impulse whose duration is proportional to the measured distance. Pololu 794

Universal metal construction parts with mounting holes. Comes with nuts and bolts. Pololu 90

A set of two Tamiya wheels with a width of 26 mm and a diameter of 65 mm. The tires have sharp lugs and are designed to operate on bumpy and uneven surfaces. Pololu 1687

Planetary gear motor consisting of two 4:1 and two 5:1 stages, which can be combined in any way to achieve 4:1, 5:1, 16:1, 20:1, 25:1, 80:1, 100:1 and 400:1 gear ratios. Pololu 70

The Tamiya 72002 gearbox with the possibility of installing racks in a gear ratio of 11.6:1 and 18:1. It is suitable for very fast vehicles or mechanisms that do not require high torque. Pololu 71

Miniature medium-power, 6 V brushed DC motor with a 51.45:1 metal gearbox. It has a cross section of 10 × 12 mm, and the D-shaped gearbox output shaft is 9 mm long and 3 mm in diameter. Pololu 2365

Bipolar stepper motor. It has a resolution of 200 steps/revolution (1.8° per step), a rated voltage of 4.5 V, and draws a current of 1 A per coil. Pololu 2297

The Step-UpU1V10F3 Buck Voltage Regulator module with output voltage 3.3V, input voltage range of 0.5-5.5V and a maximum output current of 1.2A. Pololu 2563

The Step-Up/Step-DownS7V8A Buck Voltage Regulator module with adjustable output voltage in range of 2.5-8V, input voltage range of 2.7-11.8V and a maximum output current of 0.5-1A. Pololu 2118

The Step-Up/Step-DownS7V8F5 Buck Voltage Regulator module with output voltage 5V, input voltage range of 2.7-11.8V and a maximum output current of 0.5-1A. Pololu 2123

The Step-Down D24V3F5 Buck Voltage Regulator module gives the output voltage of 5V with a wide input voltage range of 7-42V and a maximum output current of 300 mA. Pololu 2098

Unipolar/bipolar stepper motor. It has a resolution of 200 steps/revolution (1.8° per step), a nominal voltage of 5.7 V, and has a current consumption of 1 A per coil. Pololu 1476